(1) To encourage the development of logical research.
(2) To foster and strengthen interactions between people having interest for logic.
(3) To make better known logic among researchers of all fields on location.
(4) To make the work of logicians on location better known. Information will be put on this website and will be seen worlwide.
(5) To develop, promote and make better known logic in the world.


(1) Plan logical activities for January 14: a lecture, a workshop, an informal gathering, a logic tea party, a virtual event ...
(2) Build a webpage with this information, it we be linked below.
(3) Advertise and promote the event.
(4) Prepare the technical and practical details.
(5) Meet on location January 14, 2019.




Dept of Philosophy, University of Warsaw, Poland
Dept of Logic, University of Łódź, Poland
Annual Meeting of Polish Philosophical Society, Kraków Branch, Poland
Adam Mickiewicz University in Poznań, Poland
Dept of Logic, University of Wrocław, Poland
Dept of Logic and Dept of Cognitive Science, Nicolaus Copernicus University, Toruń, Poland
Dept of Mathematics of Silesian University in Katowice, Poland
Dept of Philosophy, Cardinal Wyszynski University in Warsaw, Poland

Federal University of Santa Catarina, Florianópolis, Brazil
Brazilian Academy of Philosophy, Rio de Janeiro, Brazil
Federal University of Ceara, Fortaleza, Brazil
University of Brasilia, Brasilia, Brazil
Paulista University, São Paulo, Brazil

Stanford University, California, USA
The George Washington University, Washington, USA
Cambridge Innovation Center, Cambridge, MA, USA
St. John Fisher College, Rochester, NY, USA
Louisiana Scholars' College at Northwestern State University, Natchitoches, LA, USA

Dept of Logic, Institute of Philosophy, St Petersburg State University, Russia
Dept of Algebra and Mathematical Logic and Youth Center IM&CS, Siberian Federal University, Krasnoyarsk, Siberia, Russia
International Laboratory for Logic, Linguistics and Formal Philosophy of Higher School of Economics, Dept of Logic of the Faculty of Philosophy of Moscow State University, and Dept of Logic of Institute of Philosophy Russian Academy of Sciences, Moscow, Russia
Innopolis University, Innopolis, Republic of Tatarstan, Russia
Philosophy Department, Ulyanovsk State University, Russia

Turkish Logic Society and Institute of Logic, University of Istanbul, Turkey

Pontifical Lateran University, Vatican

The Algebraic Logic Division of the Dept of Set Theory, Logic and Topology in Alfred Renyi Institute of Mathematics, Hungarian Academy of Sciences, The Logic Dept of Institute of Philosophy, Faculty of Humanities of Eotvos University, Budapest, Hungary

Mathematics Seminar of the Institute of Mathematics and Informatics, University of Pécs Mathematics and Informatics Section of the Pécs Division of the Hungarian Academy of Science, Pécs , Hungary

Dept of Philosophy, University of Tunis, Tunisia

Dept of Mathematical Logic and its Applications, Sofia University, Bulgaria

Sivatosh Mookerjee Science Centre, Sir Asutosh Mookerjee Memorial Institute, Kolkata & Calcutta Logic Circle, West Bengal, India

Institute of Philosophy, Zagreb, Croatia

Logical Education Association, Florence, Italy
Patrizio Paoletti Foundation for Development and Communication, Assisi, Italy
Dept of Mathematics, University of Padua, Padua, Italy
ALOPHIS, University of Cagliari, Cagliari, Italy

Technical University of Athens, Greece

Department of Mathematics & Computer Science,
Amirkabir University-Tehran Polytechnic, Iran

Benemérita Universidad Autónoma de Puebla, Mexico

Technological University of the Mixteca, Huajuapan de León, Oaxaca, Mexico

Dept of Philosophy, Humboldt University, Berlin, Germany

Institute of Philosophy, University of Vienna, Austria

Dept of Mathematics, University of Lisbon, Portugal

Dept of Mathematics, University of Aveiro, Portugal

Dept of Mathematics and Engineering, University of Funchal, Portugal

University of Salamanca, Spain

University of Montpellier and LIRMM, Montpellier, France

ICAM-Paris (Institut Catholique d'Arts et Métiers), Lieusaint, France

Zhejiang University, China

Dept of Philosophy, University of Valparaíso, Chile

National Chung-Cheng University, Chiayi, Taiwan

Bogotá Logic Group, Universidad Nacional de Colombia at Bogotá and Universidad de los Andes at Bogotá, Colombia

Centre for Logic and Philosophy of Science, University of Ghent, Belgium

Dept of Philosophy, University of Western Australia, Perth

Technical University of Denmark (DTU Compute), Denmark

Masaryk University, Brno, Czech Republic

Dept of Mathematics, Nazarbayev University, Astana, Kazakhstan

UQAM, Québec, Canada

University of British Columbia, British Columbia, Canada

Department of Philosophy, University of Lethbridge, Alberta, Canada

Institute of Mathematics and Computer Science, State University of Moldova, Chisinau, Moldova

Umm al-Qura University, Mecca, Saudi Arabia

Taras Shevchenko National University of Kyiv, Ukraine

The logo of the Logic Day is connected with the one of the Esperanto.

The question of a universal language was popular among logicians at the turn of the 20th century. Giuseppe Peano created one, Latino sine flexione, Louis Couturat another one, Ido, and Rudolf Carnap was fluently speaking Esperanto as explained in his intellectual autobiography.

The idea of Ludwik Lejzer Zamenhof, creator of Esperanto, was to promote peace and understanding among human beings by the development of an artificial universal language. This did not work. English is itself being used as a universal language and it makes sense if we consider some of its typical features, already pointed out at the end of the 19th century by Michel Bréal, who established "semantics", and who was the teacher of Ferdinand de Saussure.

But more important than a universal language is human reason which is itself by nature universal and that's an excellent reason to promote logic. Nowadays few people know what logic is. And there are various reasons for that, in particular because it is spread in various departments and most of the time there are no interactions within a given university between people working in logic in a computer science department, a math department, a philosophy department, a linguistics department. And for the layman logic merely reduces to the adjective "logical", he has no idea that logic is a science.

Logic is not one field among others. If we take logic seriously, as the study of reasoning, and if we consider that reasoning is the distinctive feature of human beings, considered as rational animals since the antiquity ("logical" animals originally in Greek), then logic is something really special. The World Logic Day is the celebration of humanity.